10 Automatic Clock Adjustment
10-2
CJ-series EtherNet/IP Units Operation Manual for NJ-series CPU Unit (W495)
10-1 Automatic Clock Adjustment
With the EtherNet/IP Unit, clock information is read from the SNTP server at the specified time or when
the Clock Information Adjustment Switch variable is changed to TRUE. The internal clock time in the
CPU Unit of the EtherNet/IP Unit is updated with the read time.
Note The SNTP (Network Time Protocol) server is used to control the time on the LAN.
Note In accordance with SNTP protocol specifications, automatic adjustment will not be possible from February 7,
2036. This function will no longer operate in the EtherNet/IP Unit from February 7, 2036 (an error message
will not be displayed).
10-1-1 Overview
10-1-2 Specifications
Item Specification
Protocol SNTP
Port No. 123 (UDP)
However, you can change the port number in the EtherNet/IP Unit Settings on the
Sysmac Studio.
Access to SNTP server Writes the clock information from the
SNTP server to the local CPU Unit.
Obtains the clock information from the NTP
server set up on the Network, and applies the
information obtained to the local CPU Unit.
SNTP Operation Timing Clock information is automatically updated at the following times if the SNTP function
is used.
• When the Adjust Clock Bit variable is changed to TRUE
• At the specified time
EtherNet/IP Unit
SNTP client
SNTP client
SNTP client
• At the specified time
• When the Automatic Clock Adjustment Switch
variable is changed to TRUE
Clock data is obtained from the SNTP server and
written to the CPU Unit at the following times.
Time query sent.
Time information written.
Automatic clock adjustment
SNTP server
Ethernet (EtherNet/IP)
23:59:59
EtherNet/IP Unit
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